Distribution of B streptococcal type antigens among streptococci of serological groups B, G and L.

Serotyping of streptococci of serological group B isolated from humans revealed mainly the type patterns Ia/c and III/R. The protein antigen c components were c alpha beta, c alpha and less frequently, c beta. Extracts of two group B streptococcal cultures reacted with specific antiserum against type candidate 7271. Bovine group B streptococci mainly expressed the type antigens IV/X and NT/X. Protein antigen c occurred as c alpha beta, c alpha and less frequently as c beta component. Among the non group B streptococcal cultures used in this study, only those of serological groups G and L reacted with specific antisera against protein antigens R and X.